题目:
8. Usually passengers are required to arrive at _____ one hour before ______ takes off.
A.airport; aircrafts
B.the airport, aircraft
C.an airport, a aircraft
D.the airport, the aircraft
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:A、CH3COOH为弱酸,pH=2的醋酸溶液c(H+)=0.01mol•L‾1,c(CH3COOH)远远大于0.01mol•L‾1,错误;B、因为H2O也能电离出H+,所以c(H+)>c(CH3COO-),错误;C、加水稀释100倍后,CH3COOH电离平衡...